Safety Latch Mechanism

ABSTRACT

An articulating frame of an adjustable bedframe is restricted by a safety latch mechanism from pivoting beyond a limited range of motion from its undeployed position unless an actuator lifting assembly mechanism is driving the articulating frame to pivot. Locking tabs and guides mate with each other to restrain the actuator lifting assembly mechanism from moving beyond a limited range of motion unless the actuator lifting assembly mechanism is driving the articulating frame to pivot.

CROSS-REFERENCE TO RELATED APPLICATIONS

Not applicable.

STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT

Not applicable.

THE NAMES OF THE PARTIES TO A JOINT RESEARCH AGREEMENT

Not applicable.

REFERENCE TO A “SEQUENCE LISTING,” A TABLE, OR A COMPUTER PROGRAM LISTING APPENDIX SUBMITTED ON A COMPACT DISC AND AN INCORPORATION-BY-REFERENCE

Not applicable.

BACKGROUND OF THE INVENTION 1. Field of the Invention

The invention relates to mechanisms that prevent articulated portions of a bedframe from unexpectedly popping open and that vertically restrain actuator lifting assembly mechanisms that act on the articulated portions to cause them to pivot between undeployed and deployed states.

2. Description of Information Known to the Inventor, Including References to Specific Documents Related to the Invention, and Specific Problems Involved in the State of Technology that the Invention is Drawn Toward

A bedframe may be equipped with an adjustable lifting assembly mechanism, such as that exemplified by an adjustable power bed layer of U.S. Pat. No. 10,463,163 B1, whose contents are incorporated herein by reference, or by an adjustable bed lift mechanism of U.S. Pat. No. 10,376,074 B2, whose contents are incorporated herein by reference. Both kinds of mechanisms have a stationary frame and two articulating frames. The two articulating frames pivot relative to the stationary frame from a horizontal orientation (undeployed state) to a respective angled, lifted orientation (deployed state). There are two articulating frames (located at the head-side of the bedframe and at the foot-side of the bedframe) because one is arranged to lift the head-side of a mattress and the other is arranged to lift the foot-side of the mattress.

Such a bedframe, due to its very thin profile and foldability, can exhibit unexpected behavior in handling, when unpacking or moving, for those consumers who haven't bothered to read the instructions concerning proper handling. That is, when handling the folded bedframe for moving, the head-side or foot-side can unexpectedly pop open if the bedframe is picked up incorrectly and oriented incorrectly, because the head-side and foot-side articulation of the bedframe are not vertically restrained (they are allowed to drop by gravity during powered articulation). This can be startling and unexpected for consumers, as well as annoying.

It is desired to make the consumer experience as frictionless as possible— that is, the consumer experience should enable assembly of the bedframe with little difficulty, i.e., preferably effecting assembly effortlessly without any appreciable, undesired incident. Therefore, there is a need to, in effect, lock the articulating portions down when the articulating portions are in an undeployed state, i.e., in a fully flat position. Also, there is a need to, in effect, vertically restrain the actuator lifting assembly mechanism while the articulating portions are in their undeployed state.

SUMMARY OF THE INVENTION

One aspect of the invention resides in a safety latch mechanism that locks the articulating frames of an adjustable bedframe in a flat or nearly flat position so that articulating frames won't unexpectedly open during moving/handling/repair of the bedframe. Such is operative when the articulating frames are to pivot from their undeployed state unless an actuator lifting assembly mechanism is driving the articulating frames to pivot.

A further aspect of the invention resides in providing vertical restraint for the actuator lifting assembly mechanism. Such is operative when the articulating frames are in their undeployed state unless the actuator lifting assembly mechanism is driving the articulating frames to pivot.

BRIEF DESCRIPTION OF THE DRAWING

For a better understanding of the present invention, reference is made to the following description and accompanying drawings, while the scope of the invention is set forth in the appended claims.

FIGS. 1-4 are sectional side views in succession of a foot-side adjustable mechanism for a bed frame in accordance with the invention and that is equipped with a safety latch mechanism shown emerging from a cavity of a pull bar of the foot-side adjustable mechanism as the cavity is pulled away from the safety latch mechanism.

FIG. 5 is a sectional side view that shows the result in succession to that of FIG. 1 if FIGS. 2-4 are skipped. The safety latch mechanism catches onto the top of the wall bounding the cavity and thus remains within the cavity instead of emerging from it as in FIGS. 2-4.

FIGS. 6-7 are successive isometric views showing the actuator lifting assembly mechanism of FIG. 1 being guided into engagement with tabs. FIGS. 6-7 omit showing the safety latch mechanism of FIGS. 1-5.

FIG. 8 is an isometric view of the top, rear and right side of the safety latch mechanism of FIGS. 1-5.

FIGS. 9-11 are respectively rear, bottom, and right-side views of the safety latch mechanism of FIG. 8, but with the right-side view shown rotated relative to the orientation of the right-side in FIG. 8. The left-side view is symmetric to the right-side view.

FIG. 12 is a front view of the safety latch mechanism of FIG. 8.

FIG. 13 is an isometric view in cross-section of the top, front and left side view of the safety latch mechanism of FIG. 8 and that is rotated relative to the orientation of FIG. 8.

FIG. 14 is an isometric view of the top, front and right-side of the pull bar of the actuator lifting assembly mechanism in accordance with the invention.

FIGS. 15-17 are respectively bottom, rear and right-side views of the pull bar of FIG. 14. The right-side view is symmetric to the left-side view.

FIG. 18 is an isometric view of the top, front and right-side of the foot-side linkage of the actuator lifting assembly mechanism in accordance with the invention.

FIG. 19 is an isometric view of the top, rear and right-side view of the foot-side linkage of the actuator lifting assembly mechanism of FIG. 18 albeit rotated.

FIGS. 20-22 are respectively bottom, rear and right-side views of the foot-side linkage of the actuator lifting assembly mechanism of FIGS. 18 and 19. The right-side view is symmetric to the left-side view.

FIG. 23 is an isometric view of the top, front and right-side of the foot-side linkage and of the actuator lifting assembly mechanism of FIGS. 18-22 and with the safety latch mechanism of FIGS. 8-13 in place.

FIG. 24 is an isometric view of the bottom, front and right-side view of the foot-side linkage of the actuator lifting assembly mechanism of FIG. 23 albeit rotated and with the safety latch mechanism of FIGS. 8-13 in place.

FIGS. 25-27 are respectively top, front and right-side views of the foot-side linkage of the actuator lifting assembly mechanism of FIGS. 23 and 24 and with the safety latch mechanism of FIGS. 8-13 in place. The right-side view is symmetric to the left-side view.

FIG. 28 is a schematic representation of the assembly according to the invention.

DETAILED DESCRIPTION OF THE INVENTION

Turning to the drawings, FIGS. 1-7 show an adjustable bedframe 10 having an articulating frame 20 and a stationary frame 30. An actuator lifting assembly mechanism 40 is configured to drive the articulating frame 20 to pivot as the stationary frame 30 remains stationary. FIGS. 1-4 show the manner in which safety latch mechanism 50 leaves a channel 85 of an actuator linkage pull bar 80 in response to the articulating frame 20 being driven to pivot from an undeployed state into a deployed state.

The safety latch mechanism 50 is attached to the articulating frame 20. As can be appreciated from FIGS. 1 and 5, an engagement arises between the safety latch mechanism 50 and the upper wall of the channel 85 in the event that the articulating frame 20 pivots from its undeployed state relative to the stationary frame 30 without being driven by the actuator lifting assembly mechanism 40. Such an engagement has the effect of limiting the range of motion that the articulating frame 20 can travel. The actuator lifting assembly mechanism 40 may be constructed in the same manner as that provided for the adjustable power bed layer of U.S. Pat. No. 10,463,163 B1 or for the adjustable bed lift mechanism of U.S. Pat. No. 10,376,074 B2.

As a consequence, the safety latch mechanism 50 is thus arranged to effect restriction of the articulating frame 20 from pivoting out of the undeployed state beyond the limited range of motion unless the actuator lifting assembly mechanism 40 is driving the articulating frame 20 to pivot. Thus, the articulating frame 20 is precluded from pivoting out of its undeployed state because of the presence of gravitational forces that might otherwise cause the articulating frame 20 to pivot.

FIGS. 1-5 show a safety latch mechanism 50 is configured to become “latched” by pressing against an upper inside surface of the channel 85 of the actuator linkage pull bar 80 so as to allow the articulating frame 20 to have only a very small range of motion. When “unlatched”, the safety latch mechanism 50 clears the channel 85 and no longer prevents the articulating frame 20 from pivoting to its fully angled position (deployed state) relative to the stationary frame 30 and in so doing to lift up a foot-side of a mattress (not shown) located above.

As the actuator linkage pull bar 80 engages the actuator lifting assembly mechanism 40 over an initial short distance (i.e., a “latch engagement range”) to raise or lift the articulating frame 20, the articulating frame 20 moves upward slightly within the very small range of motion that is allowed when latched. At the same time, the push/pull rod 70 of the actuator is pulling the channel 85 away from the safety latch mechanism 50 until they are fully separated while still within the “latch engagement range”, thus allowing the safety latch mechanism 50 and the channel 85 of the actuator linkage pull bar 80 to clear each other freely as the articulating frame 20 continues to rise.

The channel 85 is configured to accommodate a bent end of the latch of the safety latch mechanism 50. FIGS. 1-4 illustrate the manner that the safety latch mechanism 50 leaves its latched position to enter into its unlatched position, i.e., by becoming separated from the channel 85. However, if the articulating frame 20 is raised with the safety latch mechanism 50 in its relative position of FIG. 1, then the safety latch mechanism 50 in effect limits the range of motion that the articulating portion can travel because of its engagement as shown in FIG. 5 as it presses against an upper peripheral surface that bounds the channel 85.

In one embodiment, the actuator lifting assembly mechanism 40 is unrestrained in the vertical direction and so could lift up under manual force even with the safety latch mechanism 50 of the present invention present. Thus, a vertical restraint should be imposed. That is, the safety latch mechanism 50 may be effectively restraining the articulating frame 20 from pivoting beyond the limited range of motion, but that does not mean that the actuator lifting assembly mechanism 40 is likewise so restricted in its range of motion.

For that reason, vertical restraint may be realized by providing pairs of guides 90 for the pull bar 80 and a pair of mating locking tabs 100. That is, as the pull bar 80 (the latch interface point) enters the latching zone via the actuator lowering the articulating portions 20 (moving from FIG. 4 to FIG. 3 to FIG. 2 to FIG. 1), the pair of guides 90 of the pull bar 80 (which is what the safety latch mechanism 50 interfaces with) on each side as shown in FIGS. 6 and 7 make engagement with respective ones of mating locking tabs 100 on a pair of right-angled guide rails 110. The pull bar 80 may be slid back and forth between and upon the right-angled guide rails 110.

The engagement of the mating locking tabs 100 with respective pairs of the guides 90 keeps the pull bar 80 vertically restrained as long as the engagement remains. As the pull bar 80 is urged out of the latching zone, however, the pairs of the guides 90 and the mating locking tabs 100 disengage from each other, thereby ending the engagement and thus the actuator lifting assembly mechanism 40 is no longer vertically restrained.

If desired, the pull bar 80 may be replaced in a conventional manner by a different component that can be moved to both simultaneously cause the articulating frame 20 to pivot relative to the stationary frame 30 and disengage whatever is vertically restraining the actuator lifting assembly mechanism 40.

The safety latch mechanism 50 is depicted in FIGS. 8-13, the pull bar 80 is depicted in FIGS. 14-17, the foot-side linkage of the actuator lifting assembly mechanism 40 is depicted in FIGS. 18-22, and the foot-side linkage of the actuator lifting assembly mechanism 40 with the safety latch mechanism 50 in place is depicted in FIGS. 23-27. The foot-side linkage of the actuator lifting assembly mechanism 40 and a head-side linkage of the actuator lifting assembly mechanism 60 operate in an analogous manner with each other except that the former acts to lift the foot-side of the mattress over the foot-side of the adjustable bedframe and the latter acts to lift the head-side of the mattress over the head-side of the adjustable bedframe and thus cause respective articulating frames to pivot symmetrically relative to each other with portions of the respective frames that are the further away from each other being raised higher in the deployed state than are portions that are closer to each other.

FIG. 28 illustrates the overall arrangement of the invention by showing the relation with respect to each other of the adjustable bedframe 10 that has two articulating frames 20 and a stationary frame 30, the foot-side actuator lifting assembly mechanism 40, the safety latch mechanism 50, the head-side actuator lifting assembly mechanism 60, a mattress 70, and a pull bar 80.

While the foregoing description and drawings represent the preferred embodiments of the present invention, various changes and modifications may be made without departing from the scope of the present invention. 

What is claimed is:
 1. An apparatus that limits a range of motion of an adjustable lift assembly bedframe, comprising a plurality of components that include: an adjustable bedframe having a stationary frame and an articulating frame, the articulating frame being pivotably movable between an undeployed state and a fully deployed state, the stationary frame remaining stationary as the articulating frame pivots; an actuator lifting assembly mechanism that is arranged to impose forces that drive the articulating frame to pivot; and means for preventing at least one of the components from moving beyond a limited range of motion as long as two surfaces are in engagement with each other unless and until the actuator lifting assembly drives the articulating frame to pivot sufficiently out of the undeployed state to cause the two surfaces to disengage from each other, at least one of the surfaces moving in response to forces that drive the articulating frame to pivot.
 2. The apparatus of claim 1, wherein the at least one of the components is the articulating frame, the means for preventing including a safety latch mechanism attached to the articulating frame and that engages with the actuator lifting assembly mechanism to effect restriction on the articulating frame against pivoting beyond the limited range of motion, the safety latch mechanism having one of the two surfaces.
 3. The apparatus of claim 1, wherein the at least one of the components is the actuator lifting assembly mechanism, the preventing means including locking tabs arranged to restrain the actuator lifting assembly from moving beyond the limited range of motion.
 4. The apparatus of claim 2, wherein said actuator lifting assembly mechanism includes an actuator linkage pull bar that effects back and forth movements and has a channel, the safety latch mechanism having an end that is movable into the channel to cause engagement of the end with the actuator linkage pull bar to arise and that is movable out of the channel to cause disengagement of the end with the actuator pull bar to arise, the articulating frame being driven to pivot in response to the back and forth movements of the actuator linkage pull bar.
 5. The apparatus of claim 3, wherein said actuator lifting assembly mechanism includes an actuator linkage pull bar that effects back and forth movements, the articulating frame being driven to pivot in response to the back and forth movements of the actuator linkage pull bar, further comprising: a pair of guide rails, the actuator linkage pull bar being arranged to slide along the pair of guide rails to cause the back and forth movements to arise, the locking tabs including a pair of locking tabs that respectively protrude toward each other from the pair of guide rails, the actuator linkage pull bar being equipped with two sets of the guides that are arranged to mate with the pair of locking tabs.
 6. The apparatus of claim 4, wherein the end of the safety latch mechanism is arranged to press against a peripheral wall of the channel to cause the engagement to arise and thereby restrict the articulating frame from pivoting beyond the limited range of motion.
 7. The apparatus of claim 1, wherein with the articulating frame in the undeployed state and unless and until the actuator lifting assembly mechanism drives the articulating frame to pivot, the means for preventing is configured and arranged to prevent the articulating frame from moving beyond a limited range of motion and is configured and arranged to prevent the actuator lifting assembly mechanism from moving beyond a further limited range of motion, the means for preventing including a safety latch mechanism, which is connected to the articulating frame and engages with the actuator lifting assembly mechanism to restrain accordingly, and including locking tabs, which are configured and arranged to restrain the actuator lifting assembly mechanism.
 8. A method that limits a range of motion of an adjustable lift assembly bedframe, comprising the steps of: pivoting an articulating frame of an adjustable bedframe between an undeployed state and a fully deployed state and keeping a stationary frame of the adjustable bedframe stationary as the articulating frame pivots; arranging an actuator lifting assembly mechanism in position to impose a force to drive the articulating frame to pivot; wherein the articulating frame and the actuator lifting assembly mechanism are components; and preventing at least one of the components from moving beyond a limited range of motion as long as two surfaces are in engagement with each other unless and until the actuator lifting assembly mechanism drives the articulating frame to pivot sufficiently out of the undeployed state to cause the two surfaces to disengage from each other, at least one of the surfaces moving in response to forces that drive the articulating frame to pivot.
 9. The method of claim 8, wherein the at least one of the components is the articulating frame, the preventing being effected by engaging a safety latch mechanism with the actuator lifting assembly mechanism to restrict the articulating frame against pivoting beyond the limited range of motion unless and until the actuator lifting assembly mechanism drives the articulating frame to pivot sufficiently out of the undeployed state, the safety latch mechanism having one of the two surfaces and being attached to the articulating frame.
 10. The method of claim 8, wherein the at least one of the components is the actuator lifting assembly mechanism, the preventing being effected by restraining the locking tabs to restrain the actuator lifting assembly mechanism from moving beyond the limited range of motion unless and until the actuator lifting assembly mechanism drives the articulating frame to pivot, the locking tabs having one of the two surfaces.
 11. The method of claim 9, further comprising: effecting back and forth movements with an actuator linkage pull bar of the actuator lifting assembly mechanism, the safety latch mechanism having an end that moves into a channel of the actuator linkage pull bar to cause engagement of the end with the actuator linkage pull bar to arise and that moves out of the channel to cause disengagement of the end with the actuator pull bar to arise; and driving the articulating frame to pivot in response to the back and forth movements of the actuator linkage pull bar.
 12. The method of claim 10, further comprising: effecting back and forth movements with an actuator linkage pull bar of the actuator lifting assembly mechanism; driving the articulating frame to pivot in response to the back and forth movements of the actuator linkage pull bar; and sliding the actuator linkage pull bar along a pair of guide rails to cause the back and forth movements to arise, the locking tabs including a pair of locking tabs that respectively protrude toward each other from the pair of guide rails, the actuator linkage pull bar being equipped with two sets of the guides that are arranged to mate with the pair of locking tabs.
 13. The method of claim 11, further comprising: pressing the end of the safety latch mechanism against a peripheral wall of the channel to cause the engagement to arise and thereby restrict the articulating frame from pivoting beyond the limited range of motion.
 14. The method of claim 8, wherein the preventing occurs unless and until the actuator lifting assembly mechanism drives the articulating frame to pivot.
 15. The method of claim 14, wherein with the articulating frame in the undeployed state, the preventing includes preventing the articulating frame from moving beyond the limited range of motion by restraining the articulating frame accordingly with a safety latch mechanism that is attached to the articulating frame and engages the actuator lifting assembly mechanism to restrain accordingly, the preventing also including preventing the actuator lifting assembly mechanism from moving beyond a further limited range of motion by restraining the actuator lifting assembly mechanism accordingly with locking tabs that restrain accordingly.
 16. The method of claim 15, wherein the arranging of the safety latch mechanism is effected by attaching one of the two surfaces to the articulating frame and by engaging the safety latch mechanism with the actuator lifting assembly mechanism to restrict the articulating frame against pivoting beyond the limited range of motion. 